"working horse" meaning in English

{
  "forms": [
    {
      "form": "working horses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "working horse (plural working horses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Non-native speakers' English",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1990, C.A. Visser, “Foreword”, in J.P.M. Hamer, Practical Echocardiography in the Adult: with Doppler and Color-Doppler Flow Imaging, Dordrecht: Kluwer Academic Publishers, →DOI, page x",
          "text": "Since the introduction of ultrasound in cardiology in the mid fifties, echocar­diography has continued to grow and has finally become, in particular after the introduction of Doppler modalities, the working horse of the cardiologist.",
          "type": "quotation"
        },
        {
          "ref": "2016 April 26, Jie Ma, Lin-Wang Wang, “Using Wannier functions to improve solid band gap predictions in density functional theory”, in Scientific Reports, volume 6, →DOI, article 24924, page 1",
          "text": "Density functional theory (DFT)¹ is the main working horse for material simulations, especially for ground-state properties such as atomic structures and binding energies.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of workhorse (“someone or something that does a lot of work”)."
      ],
      "id": "en-working_horse-en-noun-55NluFCa",
      "links": [
        [
          "non-native speaker",
          "non-native speaker"
        ],
        [
          "workhorse",
          "workhorse#English"
        ]
      ],
      "qualifier": "non-native speakers' English",
      "raw_glosses": [
        "(non-native speakers' English, figuratively) Synonym of workhorse (“someone or something that does a lot of work”)."
      ],
      "synonyms": [
        {
          "extra": "someone or something that does a lot of work",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "workhorse"
        }
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "word": "working horse"
}

{
  "forms": [
    {
      "form": "working horses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "working horse (plural working horses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Non-native speakers' English"
      ],
      "examples": [
        {
          "ref": "1990, C.A. Visser, “Foreword”, in J.P.M. Hamer, Practical Echocardiography in the Adult: with Doppler and Color-Doppler Flow Imaging, Dordrecht: Kluwer Academic Publishers, →DOI, page x",
          "text": "Since the introduction of ultrasound in cardiology in the mid fifties, echocar­diography has continued to grow and has finally become, in particular after the introduction of Doppler modalities, the working horse of the cardiologist.",
          "type": "quotation"
        },
        {
          "ref": "2016 April 26, Jie Ma, Lin-Wang Wang, “Using Wannier functions to improve solid band gap predictions in density functional theory”, in Scientific Reports, volume 6, →DOI, article 24924, page 1",
          "text": "Density functional theory (DFT)¹ is the main working horse for material simulations, especially for ground-state properties such as atomic structures and binding energies.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of workhorse (“someone or something that does a lot of work”)."
      ],
      "links": [
        [
          "non-native speaker",
          "non-native speaker"
        ],
        [
          "workhorse",
          "workhorse#English"
        ]
      ],
      "qualifier": "non-native speakers' English",
      "raw_glosses": [
        "(non-native speakers' English, figuratively) Synonym of workhorse (“someone or something that does a lot of work”)."
      ],
      "synonyms": [
        {
          "extra": "someone or something that does a lot of work",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "workhorse"
        }
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "word": "working horse"
}